The maximum number of credits for which one may register after paying the above fees is 48, which is specified in the school law.

The following scholarship system for international students is available.

Japan Student Services Organization (JASSO)

Monbukagakusho honors scholarship for privately-financed international students by JASSO
This scholarship provides stipends for living expenses and other expenses related to coursework for six months. (For reference, the monthly stipend was JPY 48,000 for 2017).
(http://www.jasso.go.jp/en/study_j/scholarships/scholarship/shoureihi/index.html)
(For details, please feel free to send an e-mail to mot@kanda.nit.ac.jp.)